4l80e in 85MCSS neutral safety & reverse lights

O

ostrich

Apprentice
Aug 27, 2012
79
33
18
Ontario, Canada
#1
Just got my 4l80e back from a rebuild and looking at the neutral safety switch etc. Wondering what people have done with the wiring, or is the neutral safety switch and reverse lights on the column. I looked at my original shifter and there is no wiring, and I'm going to use the linkage rods that go to the column for park etc. The 4l80e has a big switch on the side itself, but I don't think I need it??
 
79longroof

79longroof

Greasemonkey
Jan 6, 2018
121
157
43
#2
You don't need it for the trans to function at all. All the sender did in OEM applications was change the display on the dash and trigger the reverse lights.
 
O

ostrich

Apprentice
Aug 27, 2012
79
33
18
Ontario, Canada
#5
Does the Gbody linkage control locking of the steering wheel when in Park? Looks like using the Gbody linkage with the 4L80 might be a little work. (adjustment etc.) I'd rather use the 4L80 switch if all I need is p/n safety switch and reverse lights? Wiring is easier that extending the rod etc
 
gnvair

gnvair

Apprentice
Sep 1, 2018
80
31
18
Southern New Jersey near Philly
#7
The big switch on the side of the transmission is the lever position sensor for the PCM. The 81-88 G body columns have the reverse lights and a Park/Neutral sensing switch (for the early feed back carb PCM) on the top of the column. There is no neutral safety switch as that is performed by the steering column itself by not allowing the key to turn in the Reverse or Drive positions. Some of of the earlier A/G bodies in the 78-81 period have the purple and yellow wires for the starter taped into the harness with a jumper connecting them. This was for the neutral safety switch on the clutch pedal on manual transmission cars. If you really need a neutral safety switch you could incorporate these if your car has them.
 
Last edited:
O

ostrich

Apprentice
Aug 27, 2012
79
33
18
Ontario, Canada
#9
Going to take a look this weekend to see what exactly I need to do.
Flemming42, the rod you are talking about is the one with the spring correct? It goes into the bracket on the proportioning valve.
 
fleming442

fleming442

Comic Book Super Hero
Dec 26, 2013
4,123
2,054
113
#10
Going to take a look this weekend to see what exactly I need to do.
Fleming442, the rod you are talking about is the one with the spring correct? It goes into the bracket on the proportioning valve.
No, the backdrive rod from the bellcrank at the trans up to the column... I would think a 4 speedd auto (2004r) rod would work, but the 3 speed rod was a touch too short. I cut it, and welded a schedule 80 3/8" pipe nipple in to lengthen the rod.
 
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